Investigation on wind-induced vibration of stay-cables based on field measurements of large-scale cable model and wind tunnel tests

在本研究中，澄清了高速涡流诱导振动、风诱导振动和间隙的机制，以及利用大型尺度包括电缆模型和风隧道测试进行的实地观测。从实地观测试验中，随后的结果得到了证实。“似乎是雨-风诱导的振动是在雨水条件下观察到的。”当一个台风通过网站时，有第一个出飞机模式被观察到的时候。一般来说，Galloping必须在高湍流的水流下减少。因此，还需要进行进一步的研究。However，可能会有一个在真正的住宿--Cables上的Galloing的可能性。此外，风隧道测试的结果也会随之而来。“电缆表面上的上水涟漪到雨落，风的扭转在高速涡流诱导的振动上发挥了重要的作用。”Karman涡流随电缆轴的频率变化可能会影响高速涡流诱导振动。此外，上水位上升的位置必须是一个重要的因素。在未来，有两种卡尔曼漩涡频率存在，如果人工水振动在电缆模型表面变化上的位置，那么，利用频率作为这两种频率的差异，以及结合降低的风频率来实现高速漩涡诱导振动。为了评估静态力对嵌入式电缆的内置影响，splitter板安装在用人工水裂谷唤醒的圆形圆柱体中，然后，用水裂谷的内置电缆的静态力可以衡量，而且似乎更容易合理。使用更高的结果表明，高速涡流诱导振动，包括风诱导振动，更难解释由quasi-steady theorem。

In this study, to clarify the mechanisms of high-speed vortex induced vibration, rain-wind induced vibration and galloping for the stay-cables, the field observations using large-scale inclined cable models and wind tunnel tests were conducted. From the field observation tests, the following results were obtained.・The vibrations which seems to be the rain-wind induced vibration were observed under raining condition.・The galloping type vibrations with the first out plane mode were observed when a typhoon passed the site. Generally, the galloping must be reduced under high turbulent flow. Therefore, the further research will be needed. However, there might be a possibility of galloping on the real stay-cables.Also, the results from the wind tunnel tests were as follows.・The upper water rivulet on the cable surface due to the rain fall and the wind turbulence have important rolls on the high-speed vortex induced vibration.・Frequency variation of Karman vortex sheddings along the cable axis might induce the high-speed vortex induced vibration. Also, the position of upper water rivulet must be an important factor. Furthermore, there are two kinds of Karman vortex frequencies exist, if the position of artificial water rivulet on the cable model surface varies, and then, the reduced wind velocity, using the frequency as the difference of these two frequencies, coincides with the reduced wind velocity for high-speed vortex induced vibration.・To evaluate the inclined effects on the static force for inclined cable, the splitter plate was installed in the wake of circular cylinder with artificial water rivulet, and then, the static forces for inclined cables with water rivulet can be measured and seems to be rather reasonable.・Using the upper results, high-speed vortex induced vibration including rain-wind induced vibration is rather hard to explain by the quasi-steady theorem.